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【Java】定位
作者:Dezai.CN / 发布于2013/6/17/ 550

	package com.hj.gps;

	import java.io.IOException;

	import java.util.List;
	import java.util.Locale;

	import android.location.Address;
	import android.location.Criteria;
	import android.location.Geocoder;
	import android.location.Location;
	import android.location.LocationListener;
	import android.location.LocationManager;
	import android.os.Bundle;
	import android.app.Activity;
	import android.content.Context;
	import android.view.Menu;
	import android.widget.TextView;

	public class GPS extends Activity {
	public Activity self = GPS.this;
	 @Override
	 public void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.gps);
	 LocationManager locationManager;
	
	 String context = Context.LOCATION_SERVICE;
	 locationManager = (LocationManager)getSystemService(context);
	
	 Criteria criteria = new Criteria();
	 criteria.setAccuracy(Criteria.ACCURACY_FINE);
	 criteria.setAltitudeRequired(false);
	 criteria.setBearingRequired(false);
	 criteria.setCostAllowed(false);
	 criteria.setPowerRequirement(Criteria.POWER_LOW);
	
	 String provider = locationManager.getBestProvider(criteria, true);
	
	 Location location = locationManager.getLastKnownLocation(provider);
	
	 updateWithNewLocation(location);
	
	 locationManager.requestLocationUpdates(provider, 3000, 0, locationistener);
	
	}
	
	private void updateWithNewLocation(Location location) {
	// TODO Auto-generated method stub
	String latLongString;
	TextView myLocationText = (TextView)findViewById(R.id.myLocation);

	String addressString = "没有找到地址\n";

	if(location!=null){
	double lat = location.getLatitude();
	double lng = location.getLongitude();
	
	latLongString = "纬度："+lat+"\n经度："+lng;
	
	double latitude = location.getLatitude();
	double longitude = location.getLongitude();
	
	Geocoder gc = new Geocoder(self,Locale.getDefault());
	
	try {
	 List<Address> addresses = gc.getFromLocation(latitude,longitude,1);
	 StringBuilder sb = new StringBuilder();
	
	 if(addresses.size()>0){
	 Address address = addresses.get(0);
	 for(int i=0;i<address.getMaxAddressLineIndex();i++){
	 sb.append(address.getAddressLine(i)).append("\n");
	 }
	// sb.append(address.getLocality()).append("\n");
	// sb.append(address.getLocality()).append("\n");
	// sb.append(address.getCountryName());
	 addressString = sb.toString();
	 }
	} catch (IOException e) {
	 // TODO Auto-generated catch block
	 e.printStackTrace();
	}
	}else{
	latLongString = "没有找到坐标。\n";
	}

	myLocationText.setText("您当前的坐标如下：\n"+latLongString+"\n"+addressString);
	}

	private LocationListener locationistener = new LocationListener(){

	//当坐标改变时触发此函数
	public void onLocationChanged(Location location){
	updateWithNewLocation(location);
	}
	//Provider禁用是触发此函数 比如GPS被关闭
	public void onProviderDisabled(String provider) {
	// TODO Auto-generated method stub
	
	}

	//Provider启用是触发此函数，比如Gps被打开
	public void onProviderEnabled(String provider) {
	// TODO Auto-generated method stub
	
	}
	//Provider的状态在可用、暂时不可用、和无服务三个状态直接切换时触发此函数
	public void onStatusChanged(String provider, int status, Bundle extras) {
	// TODO Auto-generated method stub
	
	}
	};

	
	 @Override
	 public boolean onCreateOptionsMenu(Menu menu) {
	 getMenuInflater().inflate(R.menu.gps, menu);
	 return true;
	 }
	}
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